Filler and accelerator for rubber compounds



Patented July 31. 1923.

UNITED STATES PATENT OFFICE.

AUGUSTUS WARREN GOULD, 0F MOUNT ANGEL, OREGON; HAZEL PHELAN EXEGUTBIX 0FSAID A. WARREN GOULD, DECEASED.

FILLER AND ACCELERATOR. FOR RUBBER CUMPOUND N'o Drawing.

To all whom it may concern:

Be it known that I, AUGUSTUS WARR N GOULD, a citizen of the UnitedStates of America, and resident of the town of Mount 5 Angel, in thecounty of Marion and State of Oregon, have invented certain new anduseful Improvements in Fillers and Accelerators for Rubber Compounds, ofwhich the following is a specification.

My invention consists of a product intended for use us a tiller andaccelerator in the manufacture of rubber products. It consists of apowder made from a tuit'aceous breccia which has been calcined.

l have found that a tuflaceous breccia when calcined and then ground toa powder has superior qualities as :1 filler and accelerator for use inmaking rubber compounds and particularly rubber which is subjected towear and in which a clinging or frictional grip is desired, as forinstance, in making vehicle tires. or in which a velvety feel in thefinished article is sought, as, for example, in the manufacture of:certain rubber toilet articles, rubber toys, etc.

The material from which I have so far made my product is a tufi'aceousbreccia which is found in the vicinity of lvlount Angel, Oregon.although deposits of the proper character fronn any source may be used.

In preparing the product the material is first crushed. calcined andthen ground to a powder of whatever degree of fineness may be requiredfor the particular product or crude of product desired.

Lalcination eliminates from the product all vegetable and volatilevproducts and converts it into a product which will unite with 4!) rubberto form a-homogeneous product. A

high percentage of this calcined tufl aceous breccia may be employed asa filler, said filler also having a highly eliicient action Serial No.475,526.

an accelerator, causing a rapid curing action of the rubber in which itincorporated.

Rubber in which this product has beeh incorporated, has superiortoughness and a high coetlicicnt of friction. It has a clinging velvetyfeel and action which in tire treads give them a non-slipping charactersuperior to that of the average tire and in tollet articles, toys etc,renders them pleasing to the touch.

I also find from experiments that a higher percentage of this productmay be incorporated in the rubber than is possible with other productsused for like purposes and yet obtain a product which is elastic andtough. The employment of this high percentage of the improved fillerproduces a rubber article which will not so readily dcteriorate or rotunder the action of forces or substances which are ordinarilydetrimental to rubber products.

The manner of handling it in making rubber products is essentially thesame as that now employed in incor orating other fillers andaccelerators in such products.

The product has :i specific gravity of approximately Its electrical andheat c nductivity is low and it is not injuriously affected bytemperatures which are quite harm tnl to the usual rubber compounds. Theraw product, having been calcined, is capable of resisting anytemperature which the associated products are able to sustain.

The source of the raw material and the process of grinding andclassifying th product is innnulerial.

\Vhat I claim as my invention is:

A composition coz'isisting of 'nbber fiikl a filler consisting: ofcalcined gtuilineous; breccia which has been ground to a powder.

Signed at Mount. Angel, Marion (cunt-y. Oregon. this 27th day of Ma1921..

AUGISTUS VVARR 1N GOULD.

